Humboldt Nutrients Humboldt RootsSpecifically Designed To Expand The Root Zone, Resulting In Healthier Crops & Larger Yields Humboldt Roots is a highly concentrated organic root stimulant that expands the root zone during the critical growth stage. The soul of every plant resides in the roots. Many gardeners neglect this fact and concentrate on the visual aspects of their plants. A large yield is directly related to a plant's metabolism rates, and plant metabolism rates are directly